Optimize docker installation

Author: Volmarg

Diff for: docker-first-run.sh

@@ -0,0 +1,3 @@
+composer install;               # install all composer packages
+composer pms-installer-docker;  # preconfigure system
+chmod 777 .env;                 # set .env file permission to let installer setting `done` flag

Diff for: docker/php-fpm/Dockerfile

@@ -14,7 +14,7 @@ RUN apt-get update -y && apt-get install -y libpng-dev
 
 RUN apt-get update && \
     apt-get install -y \
-        zlib1g-dev 
+        zlib1g-dev
 
 RUN docker-php-ext-install gd
 
@@ -25,6 +25,10 @@ RUN php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');" \
 
 COPY php.ini /usr/local/etc/php/conf.d/php.ini
 
+RUN pecl install apcu
+
+RUN pear config-set php_ini /application/docker/php-fpm/php.ini
+
 CMD ["php-fpm"]
 
 EXPOSE 9000